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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: x – ( 4x – 5 ) = 12 mong mn giúp ạ

Toán Lớp 6: x – ( 4x – 5 ) = 12
mong mn giúp ạ

Comments ( 2 )

  1. x – ( 4x – 5) = 12
    x – 4x + 5 = 12
    x . ( 1 – 4) = 12 – 5
    x . (-3) = 7
    x = 7 : (-3)
    x =  -7/3
    Vậy x = -7/3

  2. x – (4x – 5) = 12
    ⇒ x – 4x + 5 = 12
    ⇒ -3x = 12 – 5 = 7
    ⇒ x = -7/3
    Vậy  x = {-7/3}

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222-9+11+12:2*14+14 = ? ( )